Question

Given below are two statements:
Statement (I): The most widely used fish detection instrument is the echo sounder.
Statement (II): An echo sounder consists of only two major components: transducer and receiver.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement I and Statement II are true.
• B. Both Statement I and Statement II are false.
• C. Statement I is true but Statement II is false.
• D. Statement I is false but Statement II is true.

Hint:

The "brain" of the echo sounder is the transducer. It acts as both the "mouth" (sending sound) and the "ear" (listening for echoes). It is usually mounted on the bottom of the ship's hull.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
An echo sounder is an electronic device used in fisheries to detect underwater objects (fish) and measure water depth. It works by transmitting sound pulses (ultrasonic waves) into the water and measuring the time it takes for the "echo" to return after hitting an object.
Detailed Explanation:
Analysis of Statement I: The echo sounder is indeed the fundamental and most ubiquitous electronic instrument in modern fishing. From small artisanal boats to large trawlers, it is the primary tool used for locating fish schools and mapping the bottom topography. Therefore, Statement I is correct.

Analysis of Statement II: An echo sounder is a complex system that requires more than just two components to function. The four major components are:
1. Transmitter: Generates the electrical pulse.
2. Transducer: Converts electrical pulses into sound waves and vice versa.
3. Receiver: Amplifies the returning weak electrical signals.
4. Display/Recorder: Visualizes the information for the user.
Since the statement says there are "only two major components," it is factually incomplete and incorrect.

Step 2: Final Answer:
Statement I is correct, but Statement II is incorrect because it ignores the transmitter and the display unit.